Malicious PDF — malware analysis report

Static analysis result for SHA-256 10c14f3dede028a9…

MALICIOUS

PDF

45.0 KB
MD5: 8f06935bb06e910f53095e0db0288ed5 SHA-1: cb5cc394e1b2fd63fcfed90781bccb4846344a74 SHA-256: 10c14f3dede028a9b6d69df7a3a10436958c13d63dfe69edbcef4b17010530d5
166 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as 'Pdf.Exploit.Agent-36128' and by a machine learning classifier with high confidence. Embedded JavaScript streams were extracted, indicating an attempt to execute code. The JavaScript appears to be heavily obfuscated but likely aims to download and execute a secondary payload, a common technique for initial compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • ClamAV: Pdf.Exploit.Agent-36128 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-36128
  • ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV
    ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0008_000.js
4c387f97c988fcec63dbda626af0fde36b33079bf1267a37e02575b1d4dc01f3		 pdf-javascript-stream PDF /JS object 8 at offset 0x1E7 45305 bytes
javascript_obj0008_001.js
fd962c050a50bcebbdb09543941e572bb539087d36f26694cb07e9c22c20d3ae		 pdf-javascript-stream PDF /JS object 8 at offset 0x20A 45555 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36128
Obfuscation or payload: unlikely
legacy_pdfkit_stage_000.js
32c3a7045192435f942cd67afae55f25f3dfef0a7084862ead41f29f4d73a60e		 deobfuscated-js double percent-decoded annotation JavaScript at offset 0x1E7 33047 bytes

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